Abstract: Virtual reality technology was applied to the training field of urban rail transit in this article. It focused on the modeling of train equipment, the implementation of virtual reality in train immersion, and train fault maintenance.A 3D virtual train model was constructed by using 3ds MAX modeling software. Taking Unity3D as the driving engine, VC#2017 as compiler, and VR device as the external device, it implemented the function of the roaming of train maintenance scene, train equipment fault maintenance and corresponding human-machine interaction function.